Index: apps/app_echo.c
===================================================================
--- apps/app_echo.c	(revision 249842)
+++ apps/app_echo.c	(working copy)
@@ -57,17 +57,24 @@
 		if (!f) {
 			break;
 		}
-		f->delivery.tv_sec = 0;
-		f->delivery.tv_usec = 0;
-		if (ast_write(chan, f)) {
-			ast_frfree(f);
-			goto end;
+		switch (f->frametype) {
+		case AST_FRAME_VOICE:
+		case AST_FRAME_DTMF:
+			f->delivery.tv_sec = 0;
+			f->delivery.tv_usec = 0;
+			if (ast_write(chan, f)) {
+				ast_frfree(f);
+				goto end;
+			}
+			if ((f->frametype == AST_FRAME_DTMF) && (f->subclass == '#')) {
+				res = 0;
+				ast_frfree(f);
+				goto end;
+			}
+			break;
+		default:
+			break;
 		}
-		if ((f->frametype == AST_FRAME_DTMF) && (f->subclass == '#')) {
-			res = 0;
-			ast_frfree(f);
-			goto end;
-		}
 		ast_frfree(f);
 	}
 end: